The Star Carnival is a carnival happening once a year. Its only appearance thus far is in Mario Party 8. Mario, Luigi and all their friends come to their carnival in the game. MC Ballyhoo and his hat, Big Top are the hosts of the carnival. All of the tents and buildings in the fair are entrances to the party and minigames. Each time the player starts the file, Ballyhoo will fly up to the screen and welcome the player to the Star Carnival, after which they will be presented with the main menu.

Party Tent – The second biggest tent. The Party Tent is on the lower right side of the carnival.

Star Battle Arena – Most likely the main attraction. Characters face off in various boards trying to get stars. It is located to the top right, but played on the Star Carnival Stage in the center of the carnival.

Extras Zone – A tent full of games that even Miis can play here! These games are found nowhere else in the carnival. It is located to the top left of the carnival.

Fun Bazaar – Characters can come here to buy things-from games, from music to looking at character's records in games. It is located on the lower left of the carnival.

Star Carnival Stage – The main stage of the Star Carnival, located directly in the center of the Star Carnival. The Star Battles are held here and this is where the end-of-game ceremonies take place at the end of a Party Tent match.